The Heini's Tri top Singlet's more generous cut is ideal for ultra-endurance events where comfort might just trump aerodynamics. For the construction of the singlet, Heini used its Italian made fabric. This is a lightweight, high stretch fabric that conforms to your body to minimize drag during the swim. At the same time, it's quick drying so you won't remain soggy during the bike leg. It also has a UPF rating of 50+, which means that it will help to keep you shielded from the sun's rays. Once dry, the top wicks moisture away from your skin to keep you continuously dry. The singlet is form fit but features low arm openings and a deep scoop neck to minimize chafing of skin. A Long YKK zipper allows you to quickly dump heat when the need arises, while a single back pocket holds a few gels to keep you fueled on the run.